I have just received my replacement Hub V2 (had the V2 previously too) and i am trying to ‘claim it’ in the SMARTTHINGS app, not the classic app. When i go to Add Device, then click on Hub i get a message pop up:
"ADT security service coming soon
The ADT security service will be available soon. Until then, please use the SmartThings Classic mobile app to setup and control your ADT devices.